I've got 2 XenForo package installations, one on Digital Ocean using stock CentOS 6.5, the other on Linode using Centminmod. I have an email account from rackspace.com apps that I use to send SMTP mail out on the DO server. It has always worked great with XenForo But when I use the same account and credentials to send email via XenForo on the Linode/Centminmod setup, I get time out errors connecting to the rackspace mail server at secure.emailsrvr.com:443. Code: Zend_Mail_Protocol_Exception: Email to email@example.com failed: Connection timed out - library/Zend/Mail/Protocol/Abstract.php:277 Generated By: Unknown Account, 3 minutes ago Would there be a better error listed somewhere? There are no errors listed in the site's nginx error.log. The reason I believe it's server related is that I was using a gmail account to process bounced messages through the XenForo admincp, and I was getting timeout errors connecting to imap.gmail.com with that account too.